diff options
| author | Hollis Blanchard <hollisb@us.ibm.com> | 2008-07-25 13:54:52 -0500 |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2008-10-15 10:15:16 +0200 |
| commit | 83aae4a8098eb8a40a2e9dab3714354182143b4f (patch) | |
| tree | 872381c8aa610e3c1053008e967728f121fa55cb /arch/powerpc/kvm/powerpc.c | |
| parent | 20754c2495a791b5b429c0da63394c86ade978e7 (diff) | |
KVM: ppc: Write only modified shadow entries into the TLB on exit
Track which TLB entries need to be written, instead of overwriting everything
below the high water mark. Typically only a single guest TLB entry will be
modified in a single exit.
Guest boot time performance improvement: about 15%.
Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'arch/powerpc/kvm/powerpc.c')
| -rw-r--r-- | arch/powerpc/kvm/powerpc.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index b75607180dd..90a6fc422b2 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -27,6 +27,7 @@ #include <asm/cputable.h> #include <asm/uaccess.h> #include <asm/kvm_ppc.h> +#include <asm/tlbflush.h> gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn) @@ -307,14 +308,28 @@ static void kvmppc_load_guest_debug_registers(struct kvm_vcpu *vcpu) void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) { + int i; + if (vcpu->guest_debug.enabled) kvmppc_load_guest_debug_registers(vcpu); + + /* Mark every guest entry in the shadow TLB entry modified, so that they + * will all be reloaded on the next vcpu run (instead of being + * demand-faulted). */ + for (i = 0; i <= tlb_44x_hwater; i++) + kvmppc_tlbe_set_modified(vcpu, i); } void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) { if (vcpu->guest_debug.enabled) kvmppc_restore_host_debug_state(vcpu); + + /* Don't leave guest TLB entries resident when being de-scheduled. */ + /* XXX It would be nice to differentiate between heavyweight exit and + * sched_out here, since we could avoid the TLB flush for heavyweight + * exits. */ + _tlbia(); } int kvm_arch_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu, |